1 / 50

Ultrasound, not just your daddy leak detector anymore.

SDT Ultrasound Solutions What Industry Listens To. Ultrasound, not just your daddy leak detector anymore. Presented by Paul Klimuc. Defect Detection 101. The benefit of ultrasonic is that the energies produced are detectable much earlier in the failure curve. P-F Interval. P. Condition.

kinsey
Télécharger la présentation

Ultrasound, not just your daddy leak detector anymore.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SDT Ultrasound Solutions What Industry Listens To Ultrasound, not just your daddy leak detector anymore. Presented by Paul Klimuc

  2. Defect Detection 101 The benefit of ultrasonic is that the energies produced are detectable much earlier in the failure curve.

  3. P-F Interval P Condition F Time

  4. P-F Interval P Ultrasound Vibration Condition Infrared F Time

  5. Static Condition Indicators • RMS • Max RMS • Peak • Crest Factor

  6. What is RMS? • Acronym for Root Mean Square • Reflects the amount of energy present • Physical unit (we use): dBµV

  7. RMS: advantages/disadvantages Positive: • Stable • Repeatable • Suited for trending Negative: • Insensitive to short duration events • So not suited to early stage impact detection

  8. Max RMS: advantages/disadvantages Positive: • Stable and repeatable • Comparison with RMS: steady or varying signal • Suited for trending Negative: • Insensitive to early stage impact detection

  9. What is Peak? • The highest value detected in the time signal • Physical unit used: dBµV • The Sampling Rate is 8K.

  10. Peak : advantages/disadvantages Positive: • Very sensitive to any change • Suited for impact detection Negative: • Not going to be repeatable, by the very nature of infrequent transients • Trends difficult to interpret

  11. What is Crest Factor? • The Peak-to-RMS ratio • Crest Factor = Peak / RMS • No physical unit – it is a numeric ratio • Indicates how Peaky the signal is or how many impacts/RMS

  12. What is Crest Factor? • RMS value is 20dBµV • Peak is 40dBµV • Crest Factor could be expressed in dB’s • 40-20=20dB • Crest Factor is expressed in linear numbers • Crest Factor is 10 • 40dBµV = 100µV, 20dBµV = 10µV • Crest Factor is 100/10= 10

  13. Condition indicators A guide to choosing

  14. Condition indicators A comparison guide

  15. Benefits Combining the 4 condition indicators: • Better view of machinery health or performance (steam traps, mechanical) • Better evaluation of the failure severity (lubrication, mechanical, traps) • Better diagnosis capabilities (lubrication vs bearing failure) • Early stage detection (mechanical)

  16. Condition indicators and UAS • UAS handles each indicator separately • Select whichever you want for trend display • Alarms are set up individually for each • (3 Absolute, 4 Relative, 2 Safe) x 4 = 36 alarms

  17. Condition indicators and UAS Condition indicators: • Simplicity for those who want • Elaborate for those who need

  18. Slow Speed Bearings

  19. Rotating Machinery • Slow Speed Condition Monitoring • Difficult with some technologies • Ultrasound does not need 1 minute

  20. Singapore Flyer • Ferris Wheel Feng Shui • Spindle bearing measurements taken one month after rotational direction changed (Feng Shui) • 37 minutes for one rotation .0004 RPM A

  21. Rotating Machinery • Special Applications – Hoist Bearing • Doesn’t operate long enough for some tech. • 14 RPM but for 10 or 20 seconds only • BPFI expected at 2.88Hz/173CPM

  22. Time Signal • Time Signal • Impacts can be seen clearly

  23. Time Signal • Expand any area of this time signal • Apply a periodic cusor • You get a repetition frequency of 346cpm • 2x the inner race defect frequency (173cpm)

  24. Rotating Machinery • Inner Race Defect Discovered • Spalling across the length of the raceway

  25. Bearing failure example Healthy bearing: • RMS = 24.4 dBµV, Peak = 43.1 dBµV, CF = 8.6

  26. Bearing failure example Defective bearing: • RMS = 47.7 dBµV, Peak = 75.4 dBµV, CF = 21.9

  27. What’s the problem? • Over lubrication is • A huge killer of bearings • Consumes far too much grease • Consumes far too much time • Reduces reliability

  28. Applications Lubrication: • Lubrication is friction • Correctly greased: regular and pleasant signal (low RMS value) • Under or over greased: friction, and so signal is increasing • RMS is the suited indicator, throw in Peak to detect possible early stage damage

  29. The horror stories

  30. Lubrication example Healthy bearing being lubricated: • Correctly greased: RMS = 51.2 dBµV • Under-greased: RMS = 57.8 dBµV

  31. On-condition lubrication • Bearing needed grease:

  32. On-condition lubrication • Bearing already overgreased:

  33. On-condition lubrication • Using trending:

  34. Using an accelerometer

  35. Keeping it simple • The 270 has IR temperature measurement • But it is not an IR camera • The 270 has vibration measurement • But it is not a vibration data collector • That’s not the intention

  36. Using an accelerometer • Adds one extra tool to the powerful SDT270 • Means that users can make diagnosis that bit easier • Don’t need to go back to office to change tools • Don’t need to ask somebody else to do it

  37. What can I measure? • Velocity in ips or mm/s 10-1,000Hz • Acceleration in g 10-10,000Hz • RMS and Peak calculated • Dynamic measurement (Time) of both now possible with the Raw option instead of Ht. • All options controlled inside UAS Sensor Options • Supports 100mV/g ONLY

  38. This should get your attention

  39. Electrical Applications • Use ultrasound to find electrical faults • Arcing • Tracking • Corona • Special areas • Flow • Loose part monitoring

  40. Measurement Cycle • Find it, Fix it, Check it BEFORE CLEANING AFTER CLEANING

  41. Valve Inspections 1. Do a comparison method before and after the valve. OR2. Contact the valve and listen.

  42. Valves and Hydraulics • Find internal leakage and passing valves • Perform inspections without disassembly • Save hours or even days from complicated repairs • Ultrasonic Inspection of Hydraulics: • Place contact sensor on valve body and wait for system to cycle. • Ultrasound will tell you that the valve is passing or stuck in shut position.

  43. Valve Body Inspection • Checking valve for flow • Upstream and downstream • Works for any gas or liquid

  44. Valve Inspections • Identify the difference between a closed and 10% open 60cm bypass recycle valve • Dynamic measurements captured downstream • Time signals identically scaled Valve closed Valve opened 10%

  45. Max RMS Steam Trap example RMS Good trap: • Max RMS (43.3 dBµV) is higher than RMS (29.7 dBµV) Peak (51.7 dBµV)

  46. Max RMS RMS Trap example Failed closed: • RMS is low (9.4 dBµV) • Max RMS (11.5 dBµV) is close to RMS

  47. Max RMS RMS Trap example Failed open: • RMS is high (39.5 dBµV) • Max RMS is close to RMS (41.9 dBµV)

  48. THANKS!

More Related